I know it is productive to place a camera on an active scrape. I noticed a rub walking into my stand the other day, would it be worth it to place a camera on the rub?
I would suggest scouting around the area. If there are multiple rubs in the area, then you are onto something. If it's just a single rub,I wouldn't have a second thought about it.
I am giving it a try. Hopefully I can get some pics. This guy was close to the spot. Could be his rub.